EP0504861A1 - Procédé pour varier les paramètres de coupage d'une machine d'électroérosion à fil pendant l'entamage de la pièce - Google Patents

Procédé pour varier les paramètres de coupage d'une machine d'électroérosion à fil pendant l'entamage de la pièce Download PDF

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Publication number
EP0504861A1
EP0504861A1 EP92104724A EP92104724A EP0504861A1 EP 0504861 A1 EP0504861 A1 EP 0504861A1 EP 92104724 A EP92104724 A EP 92104724A EP 92104724 A EP92104724 A EP 92104724A EP 0504861 A1 EP0504861 A1 EP 0504861A1
Authority
EP
European Patent Office
Prior art keywords
cutting
values
wire
workpiece
wire electrode
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP92104724A
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German (de)
English (en)
Other versions
EP0504861B1 (fr
Inventor
Roland Masicovetere
Mauro Erba
Ivano Paganetti
Livio Mazzolini
Rino D'amario
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Agie Charmilles SA
Original Assignee
Agie Charmilles SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Agie Charmilles SA filed Critical Agie Charmilles SA
Publication of EP0504861A1 publication Critical patent/EP0504861A1/fr
Application granted granted Critical
Publication of EP0504861B1 publication Critical patent/EP0504861B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
    • B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
    • B23H7/02—Wire-cutting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
    • B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
    • B23H7/02—Wire-cutting
    • B23H7/06—Control of the travel curve of the relative movement between electrode and workpiece
    • B23H7/065—Electric circuits specially adapted therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
    • B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
    • B23H7/14—Electric circuits specially adapted therefor, e.g. power supply
    • B23H7/20—Electric circuits specially adapted therefor, e.g. power supply for programme-control, e.g. adaptive

Definitions

  • the invention relates to a method for cutting a workpiece during EDM cutting using a wire electrode, in which values for the specific cutting parameters along an entry path in the workpiece are at least partially reduced compared to the values of the cutting parameters for the actual cutting contour.
  • the wire electrode does not yet find sufficiently stable conditions at the beginning of a gap to be cut, especially if work is not being carried out in the bathroom.
  • the gap around the wire electrode is not yet symmetrical, such that the wire electrode could be loaded as if it were in the state of full cutting.
  • the aim of the invention is to reduce the risk of wire breaks in the cutting phase.
  • This goal is achieved in a generic method in that at least some of the reduced cutting parameters are changed continuously until the values provided for the actual cutting contour are reached. In this way, a sudden change in the values for the cutting parameters can be avoided.
  • the wire is not subjected to excessive or irregular loads along the entry path for a short time.
  • the values of the cutting parameters for the actual cutting contour are determined as end points for the continuous change and the path for this change at the beginning of the cutting 2). Once the end points have been reached, the contour cut should be performed under the best possible performance and rinsing conditions.
  • the values of the cutting parameters are continuously changed in such a way that finally there is also a continuous transition to the cutting contour values. The probability of a wire break is reduced to a minimum by such a smooth value transition.
  • the length of the path required for the running-in process is determined at the beginning of the cutting. This length depends on several boundary conditions. For example, the height of the workpiece influences the length in that the flushing of higher workpieces only stabilizes later compared to lower workpieces. In addition, the wire guides on higher workpieces are further apart from each other on lower workpieces. As a result, the wire vibrates more with higher workpieces and its stabilization will therefore require a longer period of time than with lower workpieces. A longer approach path is therefore required for higher workpieces than for lower ones.
  • the values of the cutting parameters determined as end points at the beginning of the cutting can be changed arbitrarily in terms of value during the movement of the wire electrode along the entry path (claim 3).
  • the values of the cutting parameters determined as end points at the beginning of the cutting can be changed arbitrarily in terms of value during the movement of the wire electrode along the entry path (claim 3).
  • any change in the cutting parameters in terms of value has the following additional advantage. If the wire electrode breaks in the entry path, the wire electrode is preferably first moved out of the workpiece and then moved back to the location of the wire electrode tear in order to cover the remaining entry distance at reduced values compared to the values in the wire break (claim 10). At the point of a wire break, the load on the wire electrode is often too great. If the user intervenes manually at the point of the wire break by changing the value, it can be avoided that the entire entry distance has to be covered again by the wire electrode. The initial values for the remaining entry route from the location of the wire break are reduced by those for the original wire break to reduce the critical load on the wire electrode.
  • the values of the reduced cutting parameters can be changed continuously to the same extent as was originally intended before the wire tear occurred.
  • the probability that the wire electrode will no longer tear is considerably increased.
  • the reduction of the values for the cutting parameters can also take place automatically, without manual intervention by the user.
  • values of cutting parameters are changed, the change of which does not result in a change in the cutting gap (claim 4).
  • a cutting parameter is, for example, the frequency of the generator.
  • the increase or decrease in the frequency leads to a minimal change, for example in the width of the cutting gap in the workpiece.
  • the cutting parameters are determined by generator values, in particular frequency, current strength, voltage, pulse time and / or flushing values, in particular the flushing pressure and / or wire-specific values, in particular wire characteristics, wire speed (claim 5).
  • the values of these cutting parameters have the advantage that they can be changed manually or automatically in a simple manner. Their change can also be checked immediately, thereby preventing errors from occurring.
  • the wire electrode particularly preferably runs through a defined approach path before the workpiece is cut (claim 6).
  • the wire preferably recognizes the location at which it arrives at the workpiece and starts from this location to continuously change the values of the reduced cutting parameters in the direction of the values provided for the actual cutting contour (claim 7).
  • the location from which the wire electrode cuts the workpiece is preferably detected, in particular via the voltage, the current, the rinsing conditions or optically (claim 8). This further automates the cutting process.
  • the wire electrode indicates when the steady change in the values for the cutting parameters can begin along the entry path.
  • the constant change in the values of the reduced cutting parameters continues when the cutting contour distance is reached, if the values provided for the actual cutting contour have not yet been reached (claim 9).
  • Fig. 1 shows a starting point 1 for a wire electrode, not shown, during EDM machining.
  • the wire electrode is first moved along a approach path 2 to a workpiece 3.
  • the spark erosion machine recognizes when the wire electrode has reached the workpiece 3 at the location of the gate 4.
  • the wire electrode cannot yet be cut at full power.
  • the reason for this, as already explained, is the asymmetrical geometry of the gap, but also the stabilization processes of the wire electrode at the beginning of the erosion. If the wire electrode were subjected to full power, a wire tear would occur at the location of the gate 4. As a result, specific values of the cutting parameters, in particular regarding the generator and the flushing, must be significantly reduced at the location of the gate 4.
  • the location of the gate 4 is followed by a run-in section 5.
  • the wire electrode is moved along this cutting path 5 with reduced power along the cutting gap.
  • the values of the cutting parameters specific to the workpiece cut are continuously increased.
  • the wire is subjected to values for the cutting parameters which roughly correspond to the values for the full cut in workpiece 3.
  • the wire electrode has reached the beginning of the actual cutting contour 7 at the end 6 of the entry path 5. Wire cracks are avoided by continuously approaching the values for the cutting parameters towards the predetermined final values when cutting the cutting contour 7.
  • the constant change in the power P L of the generator and / or the flushing is shown as a function of the entry length L in a diagram above FIG. 1. It can be seen that the graph for the change in the values in the diagram forms a ramp, the length L of which corresponds exactly to the length of the entry path 5 in the exemplary embodiment in FIG. 1. If the entry path 5 is longer than the previously mentioned ramp, ie the distance between the location of the gate 4 and the end 6 of the entry path is shorter than the length of the ramp, the wire can be driven along this remaining distance with constant power P L until it reaches the Has reached the beginning of the cutting contour 7. From then on, the maximum possible power P L is applied in full section. The constant power path can follow at the beginning or end of the ramp.
  • FIG. 2 shows the case in which the path for the entry is smaller than the distance between the location of the gate 4 and the end of the entry route 6.
  • the entry path 5 is therefore shorter than the ramp.
  • the power P L at the end 6 of the entry section does not yet correspond to the optimum performance in full section of the cutting contour 7.
  • the power of the ramp mentioned above becomes continuously changed into the cutting contour 7.
  • the running-in process is thus ended at the end 10 of the running-in according to a predetermined path for the entry. This end 10 is followed by the full cut under optimal performance conditions.
  • FIG 3 shows the insertion process according to the invention when a wire break occurs at a location 11 along the entry path 5 in the workpiece 3.
  • the wire electrode is moved backwards out of the previously cut gap.
  • the values of the cutting parameters reached by the wire electrode up to this point in time with which it was applied to the original ramp until the wire break occurred are saved.
  • the wire electrode After the wire electrode has been replaced, it is returned to the location 11 of the original wire tear.
  • the stored power values are reduced somewhat in order to avoid that due to the load on the wire electrode another crack already occurs when starting.
  • the continuous curve of the original ramp intended from the location 11 of the wire break to the end 6 of the entry route is used by the wire in so far as the values of the cutting parameters along the remaining entry route are changed in the same way.
  • the starting point for the remaining ramp in the performance diagram is now a reduced value of the cutting parameters at the location 11 of the wire break compared to the original value at this location 11 at the time of the wire break. This significantly reduces the likelihood of further wire breaks.
  • this strategy can also be used when entering a workpiece when starting from a hole in a workpiece.
  • this strategy can also be used when entering a workpiece when starting from a hole in a workpiece.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Mechanical Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
EP92104724A 1991-03-20 1992-03-18 Procédé pour varier les paramètres de coupage d'une machine d'électroérosion à fil pendant l'entamage de la pièce Expired - Lifetime EP0504861B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4109139 1991-03-20
DE4109139A DE4109139C2 (de) 1991-03-20 1991-03-20 Verfahren zum Anschneiden eines Werkstücks beim funkenerosiven Schneiden

Publications (2)

Publication Number Publication Date
EP0504861A1 true EP0504861A1 (fr) 1992-09-23
EP0504861B1 EP0504861B1 (fr) 1994-11-30

Family

ID=6427799

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92104724A Expired - Lifetime EP0504861B1 (fr) 1991-03-20 1992-03-18 Procédé pour varier les paramètres de coupage d'une machine d'électroérosion à fil pendant l'entamage de la pièce

Country Status (6)

Country Link
US (1) US5220146A (fr)
EP (1) EP0504861B1 (fr)
JP (1) JPH05111822A (fr)
KR (1) KR100200448B1 (fr)
CN (1) CN1038021C (fr)
DE (2) DE4109139C2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0188776U (fr) * 1988-06-21 1989-06-12
EP1442815A4 (fr) * 2001-11-01 2007-09-12 Mitsubishi Electric Corp Procede d'usinage par etincelage a fil et machine d'etincelage a fil

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4331033C1 (de) * 1993-09-13 1995-03-09 Grundig Ag Prüfeinrichtung zur Abstechkontrolle bei Stangendrehautomaten
JPH07266139A (ja) * 1994-03-29 1995-10-17 Fanuc Ltd ワイヤ放電加工機及びワイヤ放電加工機の加工方法
CN100409988C (zh) * 2004-06-02 2008-08-13 发那科株式会社 线放电加工机的控制装置
CN114211208B (zh) * 2021-12-27 2024-02-27 安徽金寨将军磁业有限公司 一种永磁铁氧体磁瓦合金模具圆弧面加工方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0023824A1 (fr) * 1979-08-03 1981-02-11 Fanuc Ltd. Procédé pour la remise en état d'un fil électrode cassé
EP0378280A1 (fr) * 1989-01-13 1990-07-18 Charmilles Technologies S.A. Dispositif et procédé pour contrôler la variation d'un paramètre en électroérosion avec un fil-électrode
EP0383370A1 (fr) * 1989-01-13 1990-08-22 Charmilles Technologies S.A. Dispositif et procédé de contrôle pour découper par électroérosion en évitant la rupture du fil

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1181995A (en) * 1967-05-09 1970-02-18 Inst Elektroswarki Patona A Method of Arc Welding and Building Up of Parts
DE2932734C2 (de) * 1978-08-16 1984-12-06 Mitsubishi Denki K.K., Tokio/Tokyo Verfahren zur Regelung eines Schneiderodierprozesses
US4291220A (en) * 1979-12-12 1981-09-22 Westinghouse Electric Corp. Method of welding utilizing both consumable and non-consumable electrodes
JPS58187262A (ja) * 1982-04-26 1983-11-01 Hitachi Ltd 多電極ア−ク溶接方法
JPS5973232A (ja) * 1982-10-20 1984-04-25 Mitsubishi Electric Corp ワイヤカツト放電加工装置
DE3419629C2 (de) * 1984-05-11 1986-05-28 Aktiengesellschaft für industrielle Elektronik AGIE Losone bei Locarno, Losone, Locarno Adaptives Regelverfahren zur Steuerung von Betriebsparametern beim funkenerosiven Schneiden und funkenerosive Schneidanlage hierfür
CH660857A5 (fr) * 1984-10-16 1987-05-29 Charmilles Technologies Procede pour controler la forme d'une surface usinee par un fil a eroder et dispositif pour sa mise en oeuvre.
JPS62120919A (ja) * 1985-11-20 1987-06-02 Fanuc Ltd ワイヤカツト放電加工方法
JP2520609B2 (ja) * 1986-09-06 1996-07-31 ファナック 株式会社 ワイヤ放電加工方法
JPH0673776B2 (ja) * 1988-03-01 1994-09-21 三菱電機株式会社 ワイヤ放電加工装置の断線復帰制御方法
JP2689472B2 (ja) * 1988-04-14 1997-12-10 ブラザー工業株式会社 放電加工機
JPH02160423A (ja) * 1988-12-09 1990-06-20 Mitsubishi Electric Corp ワイヤ放電加工装置の位置決め方法
US5136139A (en) * 1989-11-29 1992-08-04 Gilliland Malcolm T Pulse MIG welder for welding thin-walled copper-nickel pipe
JPH04189421A (ja) * 1990-11-20 1992-07-07 Mitsubishi Electric Corp ワイヤ放電加工方法及びその装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0023824A1 (fr) * 1979-08-03 1981-02-11 Fanuc Ltd. Procédé pour la remise en état d'un fil électrode cassé
EP0378280A1 (fr) * 1989-01-13 1990-07-18 Charmilles Technologies S.A. Dispositif et procédé pour contrôler la variation d'un paramètre en électroérosion avec un fil-électrode
EP0383370A1 (fr) * 1989-01-13 1990-08-22 Charmilles Technologies S.A. Dispositif et procédé de contrôle pour découper par électroérosion en évitant la rupture du fil

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0188776U (fr) * 1988-06-21 1989-06-12
EP1442815A4 (fr) * 2001-11-01 2007-09-12 Mitsubishi Electric Corp Procede d'usinage par etincelage a fil et machine d'etincelage a fil

Also Published As

Publication number Publication date
KR100200448B1 (ko) 1999-06-15
CN1066203A (zh) 1992-11-18
US5220146A (en) 1993-06-15
DE59200825D1 (de) 1995-01-12
KR920017755A (ko) 1992-10-21
DE4109139A1 (de) 1992-09-24
DE4109139C2 (de) 1994-09-15
JPH05111822A (ja) 1993-05-07
EP0504861B1 (fr) 1994-11-30
CN1038021C (zh) 1998-04-15

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